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Cylinder+liner+maintenance

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Cylinder+liner+maintenance,cylinder,liner,maintenance
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    Service Letter Engine Group Engine Type Ref. Date Issue Document No. Page STX Engine STX Heavy Industries STX Dalian Engine STX Metal STX Marine Service  80, Seongsan-dong,Changwon 66-5,Sinchon-dong,Changwon Bachagou,Changxing Island 452-7,Nae-dong,Changwon 17F, STX Panocean Bldg Gyeongsangnam-do,Korea Gyeongsangnam-do,Korea Harbor Industrial Zone Gyeongsangnam-do,Korea 83-5, 4-ga,Jungang-dong,Jung-gu   641-315 641-371 Dalian,China,116318 641-050 Busan, 600-725, Korea 4-Stroke All 4-stroke engine STX Marine Service Jan’.2012 1 SL2012002 1(3) Dear Sirs  After extended use of cylinder liners, cylinder liners will show signs of wear and tear. This wear is not evenly distributed. Most of the wear occurs between the reversal points of the upper and lower piston rings. And we find scuffing marks where the upper piston ring changes direction. Also most cylinder liners, especially of 4-stroke engines, will become slightly oval over time. This wear is increased lubricating oil consumption. If the surface becomes too smooth due to wear and/or glazing of the surface, the piston rings will easier break the oil film, causing even more wear. Also, in this case, any excess oil can no longer be retained by the liner surface, and will burn away instead. This causes increased lubricating oil consumption. Honing becomes desirable when rings and liners are suffering from scuffing. It improves service life of the liners and rings. Honing also rectifies the shape of the line and restores the surface cross pattern. The piston rings “running-in” is improved and the lube-oil consumption is markedly reduced. The benefits of cylinder liner honing: ▪  Remove ovality, deformations and scratch marks in the cylinder liner wall. ▪  Produce a mesh of various depths in the material for the purpose of allowing the cylinder lube oil to remain in the mesh grooves for better lubrication. ▪  Achieve a fine surface for piston ring contact in a second step (plateau honing). ▪  Remove the hardness in the liner wall surface. Cylinder liner maintenance Concerns STX-MAN all 4-Stroke engine type Summary Cylinder liner honing  Action code : When convenient      Service Letter Engine Group Engine Type Ref. Date Issue Document No. Page STX Engine STX Heavy Industries STX Dalian Engine STX Metal STX Marine Service  80, Seongsan-dong,Changwon 66-5,Sinchon-dong,Changwon Bachagou,Changxing Island 452-7,Nae-dong,Changwon 17F, STX Panocean Bldg Gyeongsangnam-do,Korea Gyeongsangnam-do,Korea Harbor Industrial Zone Gyeongsangnam-do,Korea 83-5, 4-ga,Jungang-dong,Jung-gu   641-315 641-371 Dalian,China,116318 641-050 Busan, 600-725, Korea 4-Stroke All 4-stroke engine STX Marine Service Jan’.2012 1 SL2012002 2(3) So, every overhaul in which the piston rings are replaced, the cylinder liners must be re-honed. There are two ways to do this as below. ▪  The cylinder liners can be honed at onboard by STX Marine service specialists using a special concentric honing device. Nevertheless, we only recommend this solution when there is no possibility to have this work done in a workshop ashore, as it is very difficult to ensure the necessary quality can be achieved with variable vessel heeling and trim conditions. ▪  The cylinder liners can be honed in STX Marine service workshop. We strongly recommend this solution as the workshop is the best environment for achieving the best quality results with a special honing machine and measurements before/after. Cylinder liner honing is just one of the quality service available within STX Marine Service’s portfolio of possibilities. Below is procedure of cylinder liner honing by STX Marine service. Cylinder liner cleaning Measurement Gas sealing surface lain Honing VT & PT Measurement VT & PT Cylinder liner cleaning Custom Measurement  After honing Before honing  After sealing Surface lapping  After sealing Surface lapping Cylinder liner honing    Service Letter Engine Group Engine Type Ref. Date Issue Document No. Page STX Engine STX Heavy Industries STX Dalian Engine STX Metal STX Marine Service  80, Seongsan-dong,Changwon 66-5,Sinchon-dong,Changwon Bachagou,Changxing Island 452-7,Nae-dong,Changwon 17F, STX Panocean Bldg Gyeongsangnam-do,Korea Gyeongsangnam-do,Korea Harbor Industrial Zone Gyeongsangnam-do,Korea 83-5, 4-ga,Jungang-dong,Jung-gu   641-315 641-371 Dalian,China,116318 641-050 Busan, 600-725, Korea 4-Stroke All 4-stroke engine STX Marine Service Jan’.2012 1 SL2012002 3(3) Cylinder liner honing requires suitable special honing machine and experienced personnel. STX Marine service is well equipped with the skilled, knowledgeable technicians plus well maintained tooling and the facility capable of handling the cylinder liner honing for all of your 2 and 4-stroke engines. If you would like further information about cylinder liner honing, or if you would like to check our availability for this or any other work on your engines, please contact your nearest STX Marine service office. We will be there for you, day or night. Technical service team : C109S245@onestx.com  Service sales team : C109S240@onestx.com  Yours faithfully
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